hi gardengal,
thanks for sharing your daughters chart and i am so glad the operation was a success and you have gotten beyond what must have been a very challenging time being concerned for her.
in looking at her chart one of the first things i notice is the ruler of the ascendant in the 6th house which tends to put the focus on health from the get go in some way. venus is strong in the sign libra, but in the 6th house it will be a focus on all 6th house matters to a greater extent. venus rules mercury which rules the sun in virgo as well, so we get back to the 6th house a few different ways.. there is a very close saturn/moon square in her chart as well.. the moon is not favoured by sign, whereas the saturn is strong by sign and closely conjunct the midheaven suggesting you - her mom- plays an important role in all of this.
the moon seems to have some bearing on early childhood, but i am not entirely sure how to define your daughters lifelong situation astrologically in response to what you say here : " diagnosed with juvenile rheumatoid arthritis when she was 7 and by high school, she was using a wheelchair."
my intuition is that much of this is tied to the very close saturn/moon square centered on the venus/neptune midpoint indicating a greater degree of weakness around health when you think of venus as ruler of the ascendant in the 6th and involved in this pattern.. i would include the midheaven with the saturn/moon square as the orb is very close. the nodal axis is also a part of this with saturn on the end of the south node.. some of vedic astrology suggests to a life of paying off ones past karmic debts with this placement as i understand it. it would seem you play an important role in all of this too, but i don't quite know how.. the midheaven axis connects with ones parents - father for the 4th and mom for the 10th usually.. a positive way to think of the south node is a life of service to others which is sounds as though your life has been for her, but i am reading this out of her chart, not yours..
anyway, that is some of what i see and ponder astrologically. thanks again for sharing your experiences and your obvious love for your daughter who is blessed to have you as a mom.. perhaps someone else here will offer some additional insights.. cheers james